KANALIZASYON SUYU TEMIZLEME TESISI

摘要

The invention relates to a plant for purifying waste water (effluent). In its basic structure, the plant is composed of a mechanical clarification device for the mechanical purification of the waste water, an activation tank for a first activation stage, an intermediate clarification device, a nitrification stage equipped with a trickling filter apparatus, a denitrification stage, a secondary clarification tank and a device for conducting away and, if required, treating surplus sludge. The waste water to be purified passes from the mechanical clarification device into the activation tank and from the activation tank via the intermediate clarification device into the trickling filter apparatus and finally into the secondary clarification tank. The biocoenoses between activation tank and aeration tank are separate. The activation tank is designed as a very high loading activation tank. The trickling filter apparatus operates solely as a nitrification stage. Between the trickling filter apparatus and secondary clarification tank is arranged an unaerated mixing tank as a denitrification stage. Apart from water from the trickling filter stage, surplus sludge from the activation tank can be introduced into the mixing tank, by-passing the trickling filter stage. In order to operate the plant in such a way that it works with high purification efficiency in the purification of communal waste water, the activation tank of the first activation stage is installed for operation at an oxygen content of 0.5 to 1 mg/l and thus for partial oxidative degradation. Sludge supply in the intermediate clarification device can maintain the sludge in the first activation stage in the endogenous growth phase in which substrate respiration is established.